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Cisco 3750G-24TS does not see Wireless Access Point

I have a number of Cisco Air-LAP1014N-E-K9 access points connected to switches at various sites.  These connect back to a Wireless Lan Controller via spanned VLANS.

Where switches do not provide PoE, AXIS mid span PoE injectors are used.  However, at one location the switch does not see the access point and the port remains in a Down / Down State.

I have done a reset on the port, performed a Shut / No Shut command etc but the switch port does not show a link and the port LED remains unlit.

I've tried another 3750G-24TS and got the same issue.  Is there a compatibility issue between these devices and is there any way this can be rectified?

The firmware on the switch is: 12.2(25)SEE3 (I have other switches running this firmware and see the access points fine).

Model number: WS-C3750G-24TS

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RPPreacher
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How have you tested the injector and AP?  Are you certain that its not a problem with a bad AP or injector or cabling at this 1 defective site?  Sounds more likely than a compatibilty issue, given that all of your other one work.
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ASKER

The injector and access point have all been tested at another site and work fine.
Cabling at bad site?  Can you test with different cables?
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This is a cabling issue between the AP and the power injector.

Take the AP and the power injector to the switch and plug it all in there if you can.  If that's not possible, take the AP to the power injector and try it.
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ASKER

Not a cabling issue - this has all been tested.

The access point is now seen by the switch if I configure the port to 100MB, despite both the ports on both sides being GB ports.  Setting the port to auto negotiate or 1000MB seems to cause the issue.

For now this is working, I just need to find out why the ports won't run at full capacity.
If the fast-pulse is not detected along the cable the port won't auto-negotiate.  This is usually due to a bad cable, or sometimes noise such as electricity cables close to your Cat5 or Cat6.
Also if one of the pairs is not terminated properly the fast-pulse won't reach the other end, so negotiation usually doesn't work.

The fact that the AP works at 100MB does not mean the cabling is ok, just that pairs 1 and 3 are ok.
I think with 3 different experts pointing to cabling, you should probably test with new cables.
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This is just a work around as the real answer was not found.